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A035132 Squareful (i.e. not squarefree) palindromes. 4
4, 8, 9, 44, 88, 99, 121, 171, 212, 232, 242, 252, 272, 292, 333, 343, 363, 404, 414, 424, 444, 464, 484, 525, 575, 585, 616, 636, 656, 666, 676, 686, 696, 747, 808, 828, 848, 868, 888, 909, 999, 1331, 1881, 2112, 2332, 2552, 2662, 2772, 2992, 3663, 3773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

Eric Weisstein's World of Mathematics, Squarefree

EXAMPLE

E.g. 4114 = 2 * 11^2 * 17.

MATHEMATICA

sfQ[n_]:=Max[Transpose[FactorInteger[n]][[2]]]>1; palQ[n_]:=FromDigits[Reverse[IntegerDigits[n]]]==n; Select[Range[2, 3776], sfQ[#] && palQ[#] &] (* Jayanta Basu, May 12 2013 *)

CROSSREFS

Cf. A005117, A013929, A035133.

Sequence in context: A162752 A076966 A237607 * A077572 A239520 A083807

Adjacent sequences:  A035129 A035130 A035131 * A035133 A035134 A035135

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Nov 15 1998.

STATUS

approved

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Last modified December 11 00:29 EST 2016. Contains 279033 sequences.